// CountandSay.cpp : Defines the entry point for the console application.
//
/*
The count-and-say sequence is the sequence of integers beginning as follows:
1, 11, 21, 1211, 111221, ...

1 is read off as "one 1" or 11.
11 is read off as "two 1s" or 21.
21 is read off as "one 2, then one 1" or 1211.

Given an integer n, generate the nth sequence.

Note: The sequence of integers will be represented as a string. 
*/
#include "stdafx.h"
#include <string>
#include <sstream>
using namespace std;

class Solution {
public:
    string countAndSay(int n) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        if(n == 1) return "1";
        string ret = "1";
        for(int i =2; i<=n; i++)
        {
            ret= help(ret);
        }
		return ret;
    }
    
    string help(string inStr)
    {
		
        int count = 1; string ret;
        for(int i = 1; i<= inStr.size(); i++)
        {
			if(i == inStr.size() || inStr.at(i) != inStr.at(i-1))
            {
                stringstream ss;
				ss << count;
				ret+=ss.str();
                ret+=inStr.at(i-1);
                count = 1;
            }
			else
				 count++;
        }
        return ret;
    }
};

int _tmain(int argc, _TCHAR* argv[])
{
	Solution S;
	string ret = S.countAndSay(4);

	return 0;
}

